Ashton Kutcher‘s new motivation for staying in shape is to prepare for Armageddon. “If the [bleep] hits the fan, you can get out of the [bleep],” he tells Men’s Fitness’ February issue. The star, husband of Demi Moore, is learning the Israeli fighting technique Krav Maga, which he used for his role in “Killers.” Over-energetic Kutcher also practices Bikram yoga and jogs up LA’s Runyon Canyon to work out. “All of my physical fitness regimen is completely tailored around the end of day(s). I stay fit for no other reason than to save the people I care about,” he said.